Cave system and surroundings that represent some of the most significant Karst topography phenomena, including one of the world's largest known underground river canyons. The Karst area is of special importance in the history of earth sciences.[3]

Prehistoric pile-dwellings settlements. Excavations in these sites have provided insight into life in prehistoric times during the Neolithic and the Bronze Age in Alpine Europe. Two sites in Slovenia are listed: the pile dwellings in Ig, northern group (kolišča na Igu, severna skupina), and the pile dwellings in Ig, southern group (kolišča na Igu, južna skupina). This is a transnational site that also includes sites in Austria, France, Germany, Italy, and Switzerland.[4]

Idrija has one of the two largest mercury mines in the world, with mercury being first discovered there in 1490. The site features the infrastructure and technology related to mining and mercury production and bears testimony to the intercontinental trade in mercury, which generated important exchanges between Europe and America over the centuries. The site is shared with the mining town of Almadén, Spain.[5]

In addition to the sites inscribed on the World Heritage list, member states can maintain a list of tentative sites that they may consider for nomination. Nominations for the World Heritage list are only accepted if the site was previously listed on the tentative list.[8] As of 2017, Slovenia recorded five sites on its tentative list.[9]

The area that was developed for the particular needs of alpine pasture cattle-raising, with herdsmen gradually moving the cattle up to the highlands in the summer months. Mountainous settlements developed specific farm structures, especially hayracks.[10]

A clandestine partisan hospital complex, set up during World War II. It had a capacity of up to 120 patients and provided treatment to soldiers of various nationalities. It was never discovered by the enemy forces.[11]

Karst Plateau is the region where Karst phenomena were scientifically described for the first time. Continuous human settlement for over 2000 years has created a cultural landscape with a unique identity. The karst region of Slovenia is among the richest areas in Europe in terms of flora and fauna and one of the global "hotspots" of biodiversity.[12]

The Walk of Peace from the Alps to the Adriatic – Heritage of the First World War